KR100856848B1 - A structure of prestressed concrete pavement and its construction method - Google Patents

Abstract

A prestressed concrete road pavement structure and a construction method of a prestressed concrete road pavement structure are provided to execute new and repair works in a short period of time by prestressing to a concrete pavement of a general road and tensing first and second tendons in the center of a concrete slab, to provide a high quality concrete pavement road without maintenance by restraining the formation of cracks, preventing the breakage of a concrete pavement and extending the service life, and to prevent noise occurrence and lowering of ride comfort and to improve in appearance by constructing a concrete slab of a long span in a construction site and reducing the number of joints. A prestressed concrete road pavement structure for introducing a prestressed concrete pavement method to a general road comprises a concrete slab(10) installed to a road, a tension pocket unit(50) formed between one end and the other end of the concrete slab to penetrate the concrete slab in the vertical direction, a first tendon(20) installed to the inside of the concrete slab to make one end fixed to one end of the concrete slab by an anchorage(45) and the other end extended to the inside of the tension pocket unit, a second tendon(30) installed to the inside of the concrete slab to make one end fixed to the other end of the concrete slab and the other end extended to the inside of the tension pocket unit, and a coupler(40) installed to the inside of the tension pocket unit and connecting the ends of the first and second tendons to keep the first tendon and the second tendon tensed. A construction method of a prestressed concrete road pavement structure comprises the steps of: marking the installation site of a first tendon and a second tendon on a part for concrete pavement to construct a concrete slab on a road; installing a tension pocket unit to form a tension pocket unit on the concrete slab on a part for concrete pavement; installing a first tendon and a second tendon on the installation site of the first tendon and the second tendon, and installing an anchorage coupled to the opposite ends of the first tendon and the second tendon to be located on two ends of a part for concrete pavement, and connecting the two facing ends of the first and second tendons using a coupler in the tension pocket; after installing the first and second tendons, the coupler and the tension pocket, paving concrete on a part for concrete pavement; after curing the concrete, tensing the first and second tendons by pulling at least one end of the first tendon and the second tendon coupled to the coupler after curing the concrete; and tensing the first and second tendons two times.

Description

Prestressed concrete pavement and its construction method

The present invention relates to a prestressed concrete pavement structure and its construction method, and more particularly, by introducing prestress to concrete pavement of a general road and tensioning the first and second tendons at the center of the concrete slab, New and repair works can be carried out, and the occurrence of cracks can be suppressed, thereby preventing the breakage of concrete road pavement and extending the service life, thereby providing high-quality concrete pavement without maintenance. Since the concrete slab is constructed on-site, the number of joints (joints) can be drastically reduced, and thus, the present invention relates to a prestressed concrete road pavement structure and a construction method that can prevent noise and ride comfort and improve aesthetics.

Prestressed concrete structure, as is well known, refers to a concrete structure that is pre-tensioned by the tendon to resist the load on the concrete structure.

In general, the girder 1 of the bridge is formed of such prestressed concrete, and as shown in FIG. 1 for applying prestress, a duct 2 for receiving the tendon 3 and the tendon 3, and the tendon A fixing device 4 or the like for fixing (3) to the girder 1 is used.

At this time, the fixing unit 4 is installed at both ends of the girder 1, the tendon 3 is fixed to the fixing unit 4 after tensioning one end of the tendon 3 with a hydraulic jack or the like.

On the other hand, the tendon 3 is usually composed of a plurality of strands.

In addition, the tension of the tendon 3 may be tensioned once during the construction of the girder 1, or may be tensioned during the use of the bridge after the construction is completed.

As such, in the bridge, a method of reinforcing the concrete structure by the tension force of the tendons 3 by introducing prestress into a concrete structure such as the girder 1 is widely used.

In addition, the jointed concrete pavement (JCP) is mostly used in general concrete roads that are not bridges. In other words, concrete slabs are installed in a general road, and concrete slabs are constructed. In this case, concrete laying can be performed in steps of a predetermined distance since the total length of the road cannot be laid in one day. After laying concrete, joints (joints) are formed using joint cutters (slicing machines), which are then sealed and installed. Usually, joints (joints) are formed at intervals of 6 meters.

However, in the case of the general road using the joint (joint) concrete pavement method, there is an urgent need to develop a method for reinforcing the concrete slab to compensate for the problems described in the problem to be solved below.

As described above, the prestressed concrete pavement method among the methods for reinforcing the concrete slab of the general road is applicable to the bridge, but has a difficult problem to be applied to the general road.

In other words, in the case of general roads, there are cases in which new roads and new roads are repaired

First, when the prestressed concrete pavement method is applied to a new road, the tendon is installed before the concrete is laid in order to construct the concrete slab, and then the concrete is laid. After the concrete is cured, the tendon is placed in the concrete slab. At one end it should be tensioned with a hydraulic jack.

As such, when the concrete is laid at a certain distance and the concrete is cured, the tendons are to be tensioned by the hydraulic jack at one end of the concrete slab, so that the concrete laying work cannot be continuously performed.

That is, since the concrete slab has a maximum length for introducing prestress, when one concrete slab is cured by a certain length, the tendon is strained, and after the concrete slab is laid again, the concrete slab is cured by a predetermined length and the concrete slab is cured. After tensioning the tendon, a concrete slab of a certain length is cured in this way and the tension of the tendon must be completed, and then the next concrete slab must be continued.

Therefore, in order to tension the tendon, it is necessary to wait until the concrete slab is cured, so in the case of the new road pavement in which concrete is laid step by step at a certain length, the construction time is excessive, and the prestress concrete pavement method is introduced in the general road. Would be difficult.

In addition, when the prestress is applied to the concrete pavement method for repairing the existing road, the damaged part of the existing road is removed, and after the tendon is installed on the removed part, concrete is laid.

At this time, after the laid concrete is cured, the tendon is to be tensioned by a hydraulic jack at one end of the concrete slab, so that a portion of the road is additionally removed when the crack portion of the road is removed to secure such a work space. The problem arises.

In addition, since the space secured for the tendon tension work should be laid again after the tendon tension, it is difficult to introduce the prestressed concrete pavement method even when the existing road is repaired due to the complicated construction and excessive construction time. .

As such, since it is difficult to apply the prestressed concrete pavement method applied to a conventional road to a general road, a general road to which a conventional joint (junction) concrete pavement method is applied has a volume change and a slab caused by shrinkage of concrete. Due to the curling caused by the temperature difference between the upper and lower sides, the warping caused by the humidity difference, the restraint stress caused by the friction between the slab and the lower substrate, and the stress generated by the load, many cracks are generated. The budget is being spent on the maintenance and repair cost of the concrete pavement, and congestion and delay of the vehicle due to the maintenance and repair work adds to the inconvenience of the user.

In addition, the concrete pavement of the conventional general road can not widen the gap between the joints (joints) due to the above-described generation of stress, thereby narrowing the distance between joints (joints) and increasing the number of joints (joints). In addition to the damage in the noise and the ride comfort is reduced, as well as aesthetics is also a problem that is lowered.

An object of the present invention for solving the above-mentioned problems is to introduce a prestress to the concrete pavement of the general road and to tension the first and second tendons in the center of the concrete slab, so that new and repair construction can be carried out in a short time. In addition, it is possible to provide high quality concrete pavement without maintenance by preventing the occurrence of cracks and preventing damage to concrete road pavement and prolonging its life, and also constructing long span concrete slab on site The purpose of the present invention is to provide a prestressed concrete pavement structure and construction method that can significantly reduce the number of joints (joints), prevent noise and ride comfort and improve aesthetics.

The present invention for achieving the above object, the concrete slab is installed on the road, the tension pocket portion formed between one end and the other end of the concrete slab, and one end is installed inside the concrete slab and The first tendon is fixedly coupled to one end of the concrete slab through the anchorage and the other end extends to the inside of the tension pocket, and the inner end of the concrete slab is fixed to the other end of the concrete slab through the anchorage. A second tendon coupled to the other end and extending to the inside of the tension pocket portion, and an end of the first tendon and the second tendon to be installed in the tension pocket portion and to maintain the first tendon and the second tendon in a tensioned state; It characterized in that it comprises a coupler for connecting and coupling.

In addition, a position display step of displaying the installation position of the first tendon and the second tendon in advance in the site where the concrete will be laid to install the concrete slab on the road, and the first tendon and the second tendon in the installation position, Fixtures coupled to opposite ends of the first tendon and the second tendon, respectively, are installed to be positioned at both end sides of the site where the concrete is to be placed, and the other end facing the first and second tendons is a tendon which is coupled to each other by a coupler. The installation step, the tension pocket installation step of installing a tension pocket for forming a tension pocket portion in the position where the coupler is installed, and the concrete installation step of laying the concrete in the site where the concrete is to be laid, but outside the tension pocket And, after curing of the concrete, by pulling at least one end of the end of the first tendon and the second tendon coupled to the coupler, the first, second ten By including the step of tendon tension strain it is characterized in that formed.

The present invention introduces prestress into the concrete pavement of a general road and tensions the first and second tendons at the center of the concrete slab, so that new and repair works can be performed in a short time, and the occurrence of cracks is suppressed. This prevents breakage of concrete road pavement and extends its service life to provide high quality concrete pavement without maintenance.

In addition, since the concrete slab of the long span is constructed on-site, the number of joints (joints) can be drastically reduced, thereby preventing noise and riding comfort and improving aesthetics.

In addition, the concrete laying work for constructing one concrete slab can be carried out continuously at the same time based on each joint (joint), and after the concrete is cured, the first and second tendons are tensioned at the center of the concrete slab. Since it is possible to do not need a separate workspace for tensioning the tendon, as well as the new and renovation period of the concrete pavement is shortened.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Repeated description of the same parts as in the prior art will be omitted.

Figure 2 is a plan view showing a prestressed concrete road pavement structure according to the present invention, Figure 3 is an enlarged plan view showing a tension pocket portion and a coupler in Figure 2, Figure 4 is an enlarged perspective view showing a tension pocket portion and a coupler in Figure 2 5 is a cross-sectional view showing a line AA in Figure 2, Figure 6 is a plan view showing another embodiment of the prestressed concrete pavement structure according to the present invention, Figure 7 is a prestressed concrete pavement structure according to the present invention Is a block diagram showing a construction method.

As shown, the prestressed concrete pavement structure according to the present invention is a structure for introducing the prestressed concrete pavement method to the general road, the concrete slab 10, the tension pocket portion 50, the first tendon 20, the 2nd tendon 30, and the coupler 40 are comprised.

The road is usually composed of a multi-layer pavement layer, for example, from the lower layer to an auxiliary base layer (not shown), base layer (not shown), concrete pavement (concrete slab 10). Of course, the pavement layer of the structure may be variously changed according to the road environment.

The concrete slab 10 is formed through concrete laying on the uppermost surface of the pavement layer of the road.

Since the concrete slab 10 is repeatedly expanded and contracted due to a difference in temperature and humidity, joints are formed at regular intervals in order to reduce stress and thereby prevent cracking.

Here, the joint (joint) is a horizontal joint (joint) formed in the transverse direction (the width direction of the road) of the concrete slab 10, and a longitudinal joint (joint; not shown) formed in the longitudinal direction (the longitudinal direction of the road). It can be composed of).

On the other hand, one concrete slab (10) divided by a horizontal joint (joint) formed to be spaced apart from each other is formed within the maximum length that can be introduced into the concrete pavement, that is, the one concrete slab (10) The transverse joint (joint) is located at both ends of the).

Hereinafter, the concrete slab 10 refers to one concrete slab 10 divided by the horizontal joint (joint).

In addition, the tension pocket 50 is formed between one end and the other end of the concrete slab 10, it is formed through the concrete slab 10 in the vertical direction.

At this time, the tension pocket 50 is preferably formed in the longitudinal center of the concrete slab 10. That is, the tension pocket portion 50 may be formed in the exact center of the concrete slab 10, but may be formed as close to the center as possible even if not exactly the center.

Here, the tension pocket part 50 is installed in advance before the concrete installation for the concrete slab to form the concrete slab 10, and when the concrete is installed to the outside of the tension pocket 51 That is, when the concrete is laid in place except the tension pocket 51, after the curing of the laid concrete, the tension pocket portion 50 is formed by removing the tension pocket 51. At this time, the outer shape of the tension pocket 51 and the shape of the tension pocket portion 50 is the same.

In addition, the tension pocket 51 is formed to open only the lower portion, or both upper and lower portions to serve as a formwork for forming the tension pocket portion 50 in the concrete slab 10.

In addition, the tension pocket portion 50 may be formed in a rectangular shape, but when formed in a rectangular shape, cracks may occur at the corners, so that both ends of the tension pocket portion 50 may be formed in a curved surface.

On the other hand, the tension pocket 50 is grouted with concrete after the tension of the first and second tendons 20, 30.

In addition, the first tendon 20 is installed inside the concrete slab 10, and one end is fixedly coupled to one end of the concrete slab 10 through the fixing unit 45, and the other end thereof is the tension pocket part. It extends to the inside of 50.

In addition, the second tendon 30 is installed inside the concrete slab 10, and one end is fixedly coupled to the other end of the concrete slab 10 through the fixing unit 45, and the other end thereof is the tension pocket part. It extends to the inside of 50.

Meanwhile, the first and second tendons 20 and 30 are installed on the same line in the longitudinal direction of the concrete slab 10.

In addition, the first and second tendons 20 and 30 are composed of PS steel wire or PS strands of several strands, and these tendons are well known products, and thus detailed description thereof will be omitted.

In addition, the fixing unit 45 is coupled to the pressure plate 45a at one end of the first and second tendons 20 and 30 and embedded at both ends of the concrete slab 10 when the concrete is laid. Each end of the first and second tendons 20 and 30 is fixed to both ends of the concrete slab 10. On the other hand, since the fixing unit 45 is a known product, a detailed description thereof will be omitted.

In addition, the inside of the concrete slab 10 is further provided with a steel or plastic duct 21, 31 so as to surround the outside of the first and second tendons 20, 30. Here, one end of the duct (21) 31 is integrally coupled with the pressure plate (45a) and the other end extends to the inside of the tension pocket portion (50).

That is, the first and second tendons 20 and 30 in which the ducts 21 and 31 surround the outside thereof have one end coupled to the pressure plate 45a together with the ducts 21 and 31. The other end extends to the inside of the tension pocket portion 50 together with the ducts 21 and 31.

In addition, the outer diameters of the first and second tendons 20 and 30 are formed to be smaller than the inner diameters of the ducts 21 and 31 so as to be flowable inside the ducts 21 and 31.

Meanwhile, the first and second tendons 20 and 30, the ducts 21 and 31, the pressure plate 45a, the coupler 40, the tension pocket 51, and the like are first disposed before the concrete is laid.

In addition, the coupler 40 is installed inside the tension pocket part 50 and the first and second tendons 20 to maintain the first tendon 20 and the second tendon 30 in a tensioned state. 30 is coupled to the end of the connection.

A pair of through holes 40a are formed in the coupler 40 so that each end of the first and second tendons 20 and 30 penetrates. In this case, each end of the first and second tendons 20 and 30 is coupled to penetrate the pair of through holes 40a in opposite directions.

In addition, a wedge (wedge) 41 is coupled to each end of the first and second tendons 20 and 30 passing through the pair of through holes 40a of the coupler 40. Therefore, the first and second tendons 20, 30 can be easily tensioned by a hydraulic jack (not shown), but after the tension is completed, the wedge 41 is caught by the through-hole 40a, so that the tension force is reduced. Do not loosen.

In addition, since it is difficult to tension the ends of the first and second tendons 20 and 30 simultaneously with the hydraulic jack, one of the first and second tendons 20 and 30 tends to be the tendon end of the coupler 40. When the tension is fixed and only one end of the other tendon is connected to the hydraulic jack, the first and second tendons 20 and 30 are both introduced into the stressing.

To this end, a jacking part 42 for connecting with the hydraulic jack is coupled to the side of the first and second tendons 20 and 30 connected to the hydraulic jack.

On the other hand, after tensioning the first and second tendons 20 and 30 with the hydraulic jack, the mortar inside the ducts 21 and 31 surrounding the outside of the first and second tendons 20 and 30. Or grout with cement paste. At this time, one side of the duct 21, 31 is provided with a grouting injection pipe 22, 32 to enable the grouting, one end of the grouting injection pipe 22, 32 is the concrete slab 10 Protrude out of the.

In addition, after tensioning the first and second tendons 20 and 30, the interior of the tension pocket 50 is grouted after the grouting is completed in the ducts 21 and 31.

On the other hand, the first and second tendons (20, 30) of the tension is to be carried out twice in the first, second, which will be described again in the construction method below.

The first and second tendons 20 and 30 and the tension pockets 50 are spaced apart from each other by a predetermined interval in the transverse direction of the concrete slab 10, and the tension pockets ( 50 is preferably formed to be staggered with other adjacent tension pocket portion 50 to prevent stress concentration of the concrete slab (10). That is, by forming the plurality of tension pockets 50 staggered with each other, it is possible to prevent stress concentration in this portion.

In addition, as shown in FIG. 6, the first tendon 20 or the second tendon 30 is divided into a plurality, and a tension pocket 50 is formed on the concrete slab 10 at the divided position. Inside the pocket 50, a coupler 40 is provided to connect and couple the divided ends of the first tendon 20 or the second tendon 30 in the tensioned state. ) Is divided into a plurality (two), but the first tendon 20 may be divided)

That is, in the present invention, the tension pocket 50 is formed at the center of one concrete slab 10 so that the first and second tendons 20 and 30 are concrete at one center of the concrete slab 10. The inner side of the slab 10 may be tensioned, or the tension pockets 50 may be spaced apart from each other at a predetermined distance from one concrete slab 10 so as to be formed at two places of the concrete slab 10. The first and second tendons 20 and 30 may be tensioned.

Of course, when the first tendon 20 or the second tendon 30 is divided into two or more, the first and second tendons 20 and 30 may be tensioned at two or more places of the concrete slab 10. .

For example, when the length of one concrete slab 10 is 200 meters, the tension pocket 50 is formed at a point of 100 meters to tension the first and second tendons 20 and 30 at one place. When the length of one concrete slab 10 is 300 meters, the tension pockets 50 are formed at 100 and 200 meters, respectively, and the total lengths of the first and second tendons 20 and 30 are divided into three parts. You can tension tendon in two places.

In this way, by being able to form the ultra-span concrete slab 10 up to 300 meters it is possible to significantly minimize the number of joints (joints).

On the other hand, in the above, the first tendon 20 or the second tendon 30 is divided into a plurality of cases in which the tendon is tensioned in two places of one concrete slab 10, but the first and second tendons 20 are described. Tendon can be tensioned in two places even if an additional tendon is additionally installed on one side of the first tendon 20 or the second tendon 30 without dividing the) 30.

In addition, a transverse tendon 60 is further installed in the concrete slab 10 in a direction orthogonal to the first and second tendons 20 and 30. In this case, the transverse tendon 60 is installed below the first and second tendon 20, 30 installed in the longitudinal direction.

In addition, the transverse tendon 60 is fixed in the transverse both ends of the concrete slab 10, the fixing unit 45 is coupled to both ends thereof in a tensioned state. The fixing unit 45 coupled to both ends of the transverse tendon 60 may use the same structure as the fixing unit 45 coupled to the first and second tendons 20 and 30, or may use various known products. have.

On the other hand, when the transverse tendon 60 is paving the concrete slab 10 in only one lane of the road, as described above, both ends of the transverse tendon 60 to be fixed to the transverse opposite ends of the concrete slab 10 However, when the concrete slab 10 is constructed continuously over two lanes of the road, one end of one lane transverse tendon 60 is not fixed to the concrete slab 10, but the transverse tendon 60 of the next lane. ) Will continue to be connected.

In this case, the transverse tendon 60 preferably uses a PS steel wire or a PS steel wire when paving only one lane of the concrete slab, and transversely when constructing two or more lanes continuously. It is preferable to use a PS steel bar to connect and couple the direction tendons (60).

In addition, the outside of the transverse tendon 60 is surrounded by the duct 61.

Hereinafter, the construction method of the prestressed concrete pavement structure according to the present invention will be described.

Prior to the description, the prestressed concrete pavement of the present invention is equally applicable to repairing existing roads as well as new roads.

That is, in the case of a newly built road, the auxiliary slab, the base layer, etc. are first constructed on the ground, and then the concrete slab 10 into which the prestress of the present invention is introduced is constructed.

In addition, in the case of the existing road, the first portion of the damaged portion may be removed to a certain depth, then the prestressed concrete slab 10 may be constructed thereon, or the asphalt may be removed on the damaged portion without removing the damaged portion. After a certain thickness of the furnace, the concrete slab 10 in which the prestress of the present invention is introduced may be constructed on the overlaid asphalt.

And, the construction method of the prestressed concrete road pavement structure of the present invention, the position display step (S1), tension pocket installation step (S2), tendon installation step (S3), concrete installation step (S4), tendon tension Step S5 is made.

end. Position display step (S1),

The position display step (S1), first, to display the installation position of the first tendon 20 and the second tendon 30 in advance in the site where the concrete will be laid to install the concrete slab 10 on the road to be.

That is, the first and second tendons 20 and 30 can be easily installed by displaying the positions and intervals of the first and second tendons 20 and 30 in advance.

In addition, spacers (not shown) are installed at the installation positions of the first and second tendons 20 and 30. The spacer is adjusted to the installation height of the first and second tendons 20 and 30 so as to be positioned in the vertical middle or lower portion of the concrete slab 10.

In addition, in the position display step (S1), the installation position of the transverse tendon 60 is also displayed.

I. Tension pocket installation step (S2)

The tension pocket installation step (S2), after the position display step (S1), the portion to be installed in the concrete tension pocket 51 for forming the tension pocket portion 50 in the concrete slab 10 Steps to install.

That is, the tension pocket 51 is formed to open only the lower portion or to open both the upper and lower portions to serve as a formwork for forming the tensile pocket portion 50.

The tension pocket 51 may be formed in a rectangular shape, but when formed in a rectangular shape, cracks may occur at an edge portion of the tension pocket part 50 so that both ends of the tension pocket 51 may have a curved surface 51a. It is preferable to form.

Meanwhile, as shown in FIG. 6, the first tendon 20 or the second tendon 30 may be divided into a plurality of parts, or may be additionally disposed on one side of the first tendon 20 and the longitudinal direction of the second tendon 20. When installing the tendon 30, a plurality of tension pockets 51 are installed in the longitudinal direction at the site where the concrete is to be installed.

In addition, when the plurality of first and second tendons 20 and 30 are installed in the transverse direction of the site where the concrete is to be laid in the below tendon installing step S3, the tension pocket 51 is also the site to install the concrete. A plurality of spaced apart from each other by a predetermined interval in the transverse direction is installed, wherein the tension pocket 51 is installed in a staggered staggered pocket with the other adjacent tension pocket 51 adjacent to the tension pocket 51 formed in the concrete slab (10) 50) to prevent stress concentration that may occur.

All. Tendon installation step (S3)

The tendon mounting step (S3), after the tension pocket installation step (S2), the first tendon 20 and the second tendon (20) in the installation position of the first tendon 20 and the second tendon 30 ( 30), but the fixing unit 45 coupled to the opposite ends of the first tendon 20 and the second tendon 30, respectively, is installed to be located at both end sides of the site where the concrete is to be installed. The opposite ends of the two tendons 20 and 30 are interconnected to the coupler 40 in the tension pocket 51.

The first and second tendons 20 and 30 are installed after cutting in advance in accordance with the position of the tension pocket 51 before installation.

Here, the first and second tendons 20 and 30 are installed on the same line in the longitudinal direction at the site where concrete is to be laid, and the first and second tendons 20 and 30 are respectively the ducts 21 ( 31) is installed in the inserted state. In addition, one end of the duct 21, 31 is installed in a state in which the one end of the first and second tendons 20, 30 is integrally coupled with the pressure plate 45a which is the anchorage 45 coupled to.

Meanwhile, one end of the ducts 21 and 31 is coupled to the pressure plate 45a together with one end of the first and second tendons 20 and 30, but the other end of the ducts 21 and 31. Is installed to extend to the inside of the tension pocket 51.

In addition, the outer diameters of the first and second tendons 20 and 30 are formed smaller than the inner diameters of the ducts 21 and 31 so as to be able to flow in the ducts 21 and 31.

On the other hand, one side of the duct 21, 31 is provided with a grouting injection pipe 22, 32 to grout the interior of the duct 21, 31 after the tendon tension step (S5), At this time, one end of the grouting injection pipes 22 and 32 is installed to protrude out of the concrete slab 10.

In the tendon installation step (S3), the transverse tendon is disposed in a direction orthogonal to the first and second tendon 20, 30 in the lower side of the first and second tendon 20, 30 installed in the longitudinal direction. 60 is installed, but the fixing unit 45 coupled to both ends of the transverse tendon 60 is further installed to be positioned at both transverse ends of the site where the concrete is to be laid.

In addition, in the tendon installation step S3, reinforcing bars (not shown) may be further installed to relieve concrete stress at the fixing end of the concrete slab 10.

In addition, the coupler 40 connecting the first and second tendons 20 and 30 is positioned inside the tension pocket 51 installed in the longitudinal center of the site where the concrete is to be placed. At the center of the slab 10 it is possible to tension the first and second tendons 20, 30 in the inward direction of the concrete slab 10.

In addition, as shown in FIG. 6, the first tendon 20 or the second tendon 30 may be divided into a plurality of parts, and in this case, the coupler 40 is connected to the opposite end of the tendon 30. do. In this way, when the tendon 30 is divided into a plurality, the tendon 30 can be tensioned at the divided position of the tendon 30, so that the maximum length of the tendon can be further lengthened, thereby allowing one concrete slab 10. It is possible to construct longer the length of).

In addition, when the length of one concrete slab 10 can be constructed longer, the number of joints (joints) can be minimized.

On the other hand, the first tendon 20 or the second tendon 30 may be divided into a plurality of pieces to tension the tendons at two places of one concrete slab 10, but the first tendon 20 or the second tendon It is preferable to provide another tendon 30 further on one side of 30. In this way, by installing a plurality of independent tendons in one concrete slab 10 and connecting each tendon with the coupler 40, the tendons may be tensioned at two or more places.

And, in the tendon installation step (S3), it is preferable to install a plurality of the first and second tendons 20, 30 spaced apart from each other at regular intervals in the lateral direction of the site where the concrete is to be installed.

On the other hand, the description of the structure of the fixing unit 45 and the coupler 40 has been described above and will be omitted.

la. Concrete laying step (S4)

The concrete laying step (S4), after installing the first, second tendon 20, 30, coupler 40, the tension pocket 51 is a step of laying concrete at the site where the concrete will be installed. . At this time, it is preferable to install the outer side of the tension pocket 51 when the concrete is installed, that is, to install except the portion in which the tension pocket 51 is installed.

Meanwhile, when the concrete is cured, the tension pocket 51 is removed. When the tension pocket 51 is removed, the tension pocket 50 is formed at the removed portion.

When the concrete is cured, fixing units 45 coupled to one end of each of the first and second tendons 20 and 30 are fixed to both ends of one concrete slab in the longitudinal direction, and the concrete slab is fixed. Fixing holes 45 coupled to both ends of the transverse tendon 60 are fixed to both transverse ends of the 10.

In this case, the coupler 40 is positioned inside the tension pocket part 50 in a state in which the first and second tendons 20 and 30 are connected to each other.

Meanwhile, the fixing unit 45 coupled to one end of the transverse tendon 60 is completely embedded and fixed to the transverse one end of the concrete slab 10 and coupled to the other end of the transverse tendon 60. The fixing unit 45 is fixed to the other end of the concrete slab in the transverse direction is installed in the form of the other end of the transverse tendon 60 is exposed, transverse tendon 60 in the lower tendon tension step (S5) It is designed to tension).

hemp. Tendon tension stage (S5)

The tendon tension step (S5), after curing of the concrete, by pulling at least one end of the end of the first tendon 20 and the second tendon 30 coupled to the coupler 40, the first, Two tendons (20, 30) is the step of tension.

That is, since it is difficult to tension the ends of the first and second tendons 20 and 30 by simultaneously connecting to the hydraulic jack, only the end of any one of the first and second tendons 20 and 30 is connected to the hydraulic jack. It is preferable to strain, and in this case, stressing is introduced into both the first and second tendons 20 and 30.

And, the tendon tension step (S5) is because the tension pocket portion 50 is formed in the center of the concrete slab 10, the first, second tendon 20, 30 in the center of the concrete slab 10 ) Is tensioned inward (center direction) of the concrete slab 10.

In addition, as shown in FIG. 6, when the first tendon 20 or the second tendon 30 is divided into a plurality of parts and the divided parts are mutually coupled to the coupler 40, the first tendon 20 is formed. Alternatively, the tendons are tensioned by pulling at least one of the divided ends of the second tendons 30.

That is, as shown in Figure 6, when a total of three tendons in a longitudinal direction in one concrete slab 10 is connected to each of the couplers 40, the two tendons of the three tendons except the central tendon is simultaneously tensioned. It is preferable to make it.

And, the tendon tension step (S5), the tension is to be carried out in the first and second stages,

First, the first tension step is to tension the first and second tendons (20, 30) between 3 to 24 hours after the concrete installation, at this time 6 to 12 hours after the concrete installation to suppress the occurrence of lateral cracking It is more preferable to perform primary tension in between.

This first tension step prevents lateral cracking in the early stages of concrete. Here, if the first tension step is carried out 3 hours after the concrete installation, the strength of the concrete is not secured, so cracking may occur when the tension is applied. Cracking may occur.

Next, the secondary tension step is to strain the first, second tendon (20, 30) more strongly during the first tension step between 24 to 72 hours after the concrete installation, this time 48 hours after the concrete installation, It is more preferable to perform secondary tension afterwards.

This secondary tension step prevents cracking because it does not allow the tensile stress of the concrete by introducing all the necessary tension when the strength of the concrete is secured after the first tension.

Here, if the secondary tension step is carried out 24 hours after the concrete installation, the strength of the concrete is not secured enough to introduce all the necessary tensions, and thus cracking may occur. The strength of the concrete is secured enough to introduce all the tensions, but the possibility of initial lateral cracking is increased and the construction time is delayed, which adds to the inconvenience of the user.

After curing the concrete, the first and second tendons 20 and 30 are tensioned as well as the transverse tendons 60. In the case of the transverse tendon 60, one end is fixed to the transverse one end of the concrete slab 10, but the other end is exposed to the transverse other end of the concrete slab 10 so that the transverse tendon ( The other end of 60) is tensioned using a hydraulic jack and then fixed.

On the other hand, after completing the first and second tendons of the first and second tendons 20 and 30, the ducts 21 and 31 installed to surround the outside of the first and second tendons 20 and 30. The grouting process is performed to grout with a mortar or cement paste in the interior. That is, grouting is performed through the grouting injection pipes 22 and 32 installed on one side of the ducts 21 and 31.

Of course, the inside of the duct 61 surrounding the outside of the transverse tendon 60 is also subjected to grouting.

As such, after the tension between the first and second tendons 20 and 30 and the transverse tendons 60 is completed and grouted to the inside of the ducts 21, 31 and 61, the tension pocket part ( The grout pocket portion 50 is filled by proceeding the grouting of the inside of the concrete 50.

As described above, the present invention can be carried out continuously at the same time the concrete laying work for constructing one concrete slab 10 on the basis of each joint (joint), and after the concrete is cured concrete Since the first and second tendons 20 and 30 can be tensioned at the center of the slab 10, a separate work space for tensioning the tendons is not required, and the new and repair period of concrete pavement can be shortened. Can be.

In addition, since the first and second tendons 20, 30 can be tensioned in the center of the concrete slab 10, even when repairing an existing road, there is no need for a work space for tensioning the tendons, thus removing only the damaged part. Tendon strains are possible after concrete pavement and curing.

On the other hand, the prestressed concrete road pavement structure and construction method according to the present invention, as well as general roads and highways, airport pavement (halfway), harbor aprons, railway freight facilities or factories, parking lots, temporary roads (road), intersection It can be applied to exhibition facilities, roads, etc

1 is a cross-sectional view showing a girder of a bridge to which a conventional prestressed concrete is applied,

Figure 2 is a plan view showing a prestressed concrete road pavement structure according to the present invention,

3 is an enlarged plan view illustrating a tension pocket and a coupler in FIG.

4 is an enlarged perspective view illustrating the tension pocket part and the coupler in FIG. 2;

5 is a cross-sectional view illustrating a line A-A in FIG. 2;

Figure 6 is a plan view showing another embodiment of the prestressed concrete pavement structure according to the present invention,

7 is a block diagram showing a construction method of prestressed concrete pavement structure according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: concrete slab 20: first tendon

21, 31, 61: duct 22, 32: grouting injection pipe

30: second tendon 40: coupler

45: anchorage

50: tension pocket 51: tension pocket

60: transverse tendon

Claims (17)

Concrete slab (10) is installed on the road, A tension pocket part 50 formed between one end and the other end of the concrete slab 10, In addition to being installed inside the concrete slab 10, one end is fixedly coupled to one end of the concrete slab 10 through the fixing hole 45, and the other end extends to the inside of the tension pocket part 50. Tendon 20, In addition to being installed inside the concrete slab 10, one end is fixedly coupled to the other end of the concrete slab 10 through the fixing unit 45 and the other end extends to the inside of the tension pocket part 50. Tendon (30), The ends of the first and second tendons 20 and 30 are connected to be installed inside the tension pocket 50 and to maintain the first tendons 20 and the second tendons 30 in a tense state. Prestressed concrete pavement structure, characterized in that comprises a coupler (40) for coupling. The method of claim 1, The first and second tendons 20, 30 are installed in the longitudinal direction of the concrete slab 10, the tension pocket portion 50 is characterized in that formed in the longitudinal center of the concrete slab 10 Prestressed concrete pavement structure. The method of claim 1, Prestressed concrete road pavement structure, characterized in that the inside of the tension pocket portion 50 is grouted with concrete. The method of claim 1, Prestressed concrete road pavement structure, characterized in that the inside of the concrete slab 10 is further provided with a duct (21, 31) to surround the outside of the first and second tendons (20, 30). The method of claim 1, The first tendon 20 or the second tendon 30 is divided into a plurality and a tension pocket portion 50 is formed on the concrete slab 10 in the divided position, the inside of the tension pocket portion 50 Prestressed concrete road pavement structure, characterized in that the coupler (40) for connecting and coupling in the tensioned state of the divided end of the first tendon (20) or second tendon (30). The method of claim 1, Inside the concrete slab 10, the transverse tendon 60 is further installed in a direction orthogonal to the first and second tendons 20 and 30, and the transverse tendon 60 is in a tensioned state. Prestressed concrete road pavement structure, characterized in that both ends are fixedly coupled to both ends of the concrete slab in the transverse direction. The method of claim 1, Prestressed concrete road pavement structure, characterized in that both ends of the tension pocket portion 50 is formed in a curved surface. The method of claim 1, The first and second tendons 20, 30 and the tension pocket portion 50 are spaced apart from each other by a predetermined interval in the transverse direction of the concrete slab 10 is installed, the tension pocket portion 50 is adjacent Prestressed concrete road pavement structure, characterized in that it is formed alternately with the other tension pocket portion (50). Position display step (S1) for displaying the installation position of the first tendon 20 and the second tendon 30 in advance in the site where the concrete will be laid in order to construct the concrete slab 10 on the road, A tension pocket installation step (S2) for installing a tension pocket 51 for forming the tension pocket portion 50 in the concrete slab 10 at a site where the concrete is to be laid; The first tendon 20 and the second tendon 30 are installed at the installation positions of the first tendon 20 and the second tendon 30, but the first tendon 20 and the second tendon 30 are formed. Fixtures 45 respectively coupled to opposite ends are installed to be located at both end sides of the site where the concrete is to be placed, and the other ends of the first and second tendons 20 and 30 facing each other are in the tension pocket 51. Tendon installation step (S3) and the interconnection coupled to the coupler 40 in, Concrete installation step (S4) for laying the concrete at the site to be laid in the concrete, but to the outer side of the tension pocket 51; After curing of the concrete, the first and second tendons 20 and 30 are pulled by pulling at least one end of the ends of the first tendon 20 and the second tendon 30 coupled to the coupler 40. Construction method of the prestressed concrete road pavement structure characterized in that it comprises a tension tendon tension step (S5). The method of claim 9, The tendon tension step (S5), the first tension step to tension the first and second tendons (20, 30) between 3 to 24 hours after the concrete installation, and between 24 to 72 hours after the concrete installation Construction method of the prestressed concrete road pavement structure, characterized in that the first, second tendon (20) (30) made of a second tension step to more intensely during the first tension step. The method of claim 10, After the secondary tension step, to perform a grouting step of grouting with a mortar or cement paste in the interior of the ducts 21 and 31 installed to surround the outside of the first and second tendons 20 and 30. Construction method of prestressed concrete pavement structure characterized by the above-mentioned. The method of claim 9, The coupler 40 and the tension pocket 51 to be installed in the tendon mounting step (S3) and the tension pocket installation step (S2) is installed in the longitudinal center of the site where the concrete will be installed, The tendon tension step (S5) is the construction method of the prestressed concrete road pavement structure, characterized in that for tensioning the first and second tendons (20, 30) in the center of the concrete slab (10). The method of claim 9, After the concrete laying step (S4) to proceed with the step of removing the tension pocket 51, After the tendon tension step (S5), the construction method of the prestressed concrete road pavement structure, characterized in that the step of grouting the interior of the tension pocket portion 50 with concrete. The method of claim 9, In the tension pocket installation step (S2) to install a plurality of tension pockets 51 in the longitudinal direction on the site where the concrete is to be installed, In the tendon installation step (S3), the first tendon 20 or the second tendon 30 is divided into a plurality of parts, and the opposite ends of each tendon are coupled to the coupler 40 in the plurality of tension pockets 51. ), In the tendon tension step (S5), the tendon is tensioned by pulling at least one end of the divided ends of the first tendon 20 or the second tendon 30 coupled to the coupler 40. Construction method of prestressed concrete road pavement structure to do. The method of claim 9, In the tendon installation step (S3), the transverse tendon 60 is further installed in a direction orthogonal to the first and second tendon 20, 30, and the anchorages are coupled to both ends of the transverse tendon 60. 45) further proceeds to install the concrete so as to be located at both ends of the transverse direction, the transverse tendon 60, after curing of the concrete, prestressed concrete pavement structure, characterized in that the tension Construction method. The method of claim 9, Both ends of the tension pockets 51, the construction method of prestressed concrete road pavement structure, characterized in that formed in the curved surface (51a). The method of claim 9, In the tendon installation step S3 and the tension pocket installation step S2, the first and second tendon 20, 30 and the tension pocket 51 are spaced apart from each other by a predetermined interval in the transverse direction of the site where the concrete is to be laid. To install a plurality of, the tension pocket 51 is a construction method of prestressed concrete road pavement structure, characterized in that the staggered installation with other adjacent tension pockets (51).

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